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Having just completed tests with IAX2 trunks with Asterisk we now can no longer wait for Voipfone to introduce an IAX service. The registration problems with SIP are simply eliminated with IAX. As a result we need to port a range of numbers to a provider that can offer IAX - probably Gradwell.

We need to maintain continuity of service during the migration and that is presenting concerns. Could anyone advise on the timescale to port the number to Gradwell and how continuity could be assured? One option I have considered is setting up seperate numbers on Gradwell and using PSTN divert to these then setting up IAX trunks for the ported numbers after transferring. Would anyone have experience of this? I had hoped that the transfer would then be seamless - one minute the calls would be delivered via the PSTN divert to one IAX trunk then when transfer is completed the delivery would be through a second IAX trunk.

Can't really comment on migration paths to Gradwell but we have recently developed IP registration which is testing well and appears to solve the problems some * users have had with registration (and is useful for several other reasons).

Do you have a static IP? and would you be interested in seeing if this works for you?

I would be keen to try the system. However we have been through this for weeks and continually tried something that would fix the issue and in all cases it has not done so. I am not confident to continue to use SIP trunks and now that I have fully evaluated IAX2 trunks I am convinced this is the way to go. The fact that the Asterisk server at the provider initiates the trunk call to the client server on a per-call basis then aggregates all simultaneous trunk calls into a single connection is a big bonus for stability IMO. To date it hasnt failed during testing and we managed to get 12 simultaneous calls delivered to a SNOM 360 via local Asterisk server using this system. We have never achieved that using SIP or Voipfone.

What does the IP registration system entail and how quickly can we test it?

Finally, as you use Asterisk systems can you enable IAX trunks even on a bespoke basis to try to keep the client and system we are proposing to migrate? I know your numbers deliver from Magrathea and I have a test account with them running IAX trunks that also works very well indeed. If you could enable IAX I could provide the IP address and user/pass for the IAX authentication?

I appreciate you are a SIP provider and are reluctant to support IAX. At least that does clarify the issue of when IAX support will be available and I appreciate that.

I would disagree with the usefuless of IAX over SIP. The push nature of IAX for trunk delivery, aggregation of multiple calls into a single connection, ease of NAT delivery and easy traffic shaping all have considerable benefits IMO. However I feel it is only useful for its intended purpose as a trunk delivery system. I fully agree that SIP is much more usable for endpoint delivery and thus better suits a centrex type system.

I am very keen to test the IP registration system. Could you clarify what this will involve and how you feel it benefits the registration issues? I have most phones on routed static IP addresses.

Trial now in place along with a few other interesting bits thanks to the fantastic support at Voipfone. Lee and Tim have been awesome and I often see support at Voipfone take a beating. I have nothing but praise for the help I have received over the past few days and I really could not have asked for any further help or assistance. Great work guys and one very impressed customer of your support